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A Redox-Active Bistable Molecular Switch Mounted inside a Metal-Organic Framework.

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  • 1Department of Chemistry, Faculty of Science, King Abdulaziz University , Jeddah 21589, Saudi Arabia.

Journal of the American Chemical Society
|November 3, 2016
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Summary

We integrated bistable mechanically interlocked molecules (MIMs) into NU-1000 metal-organic frameworks (MOFs). These molecules retain their redox-switching dynamics within the MOF nanopores, demonstrating robust molecular motion.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Nanotechnology

Background:

  • Mechanically interlocked molecules (MIMs) are sophisticated molecular architectures with tunable properties.
  • Metal-organic frameworks (MOFs) offer porous structures ideal for hosting functional molecular components.
  • Integrating MIMs into MOFs presents opportunities for advanced functional materials.

Purpose of the Study:

  • To incorporate bistable mechanically interlocked molecules ([2]catenanes) into a robust zirconium-based metal-organic framework (MOF), NU-1000.
  • To investigate the retention and dynamics of the MIMs' switching behavior within the MOF's nanoporous structure.
  • To demonstrate the feasibility of using MOFs as platforms for dynamic MIMs.

Main Methods:

  • Post-synthetic functionalization of the NU-1000 MOF.
  • Incorporation of bistable [2]catenanes into the hexagonal channels of NU-1000.
  • Characterization using solid-state UV-vis-NIR reflectance spectroscopy and cyclic voltammetry.

Main Results:

  • Successful incorporation of approximately two bistable [2]catenanes per repeating unit of NU-1000.
  • Retention of the reversible redox-switching capability of the incorporated bistable [2]catenanes.
  • Demonstration of robust dynamics of bistable MIMs within the MOF nanopores.

Conclusions:

  • Bistable mechanically interlocked molecules can be effectively integrated into MOF structures.
  • The dynamic functions of MIMs are preserved when encapsulated within MOF nanopores.
  • This work establishes MOFs as viable hosts for dynamic molecular systems.